Oklahoma State University

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Answer all of the questions below. If you
do not know an answer enter CNA. However, it will help me the most if you answer
each question with your best intuition/idea about what would be a reasonable
answer.

The BCE must be completed before class starts, for this BCE class has already met. It will not count towards your BCE total. NOTE: If class has not started and you receive this message, go ahead and do the BCE, I'll still count it.

First Name:

Last Name:

School:

1. Provide brief definitions for each of the following terms,

a) atom

b) molecule

c) element

d) compound

e) formula

f) solution

2. Here are five boxes that contain matter depicted at the particulate level (level of atoms and molecules).

Use the boxes above to answer each of the following questions:

i) Which of the boxes represents a sample of an element? Select all that apply. (Note: look at your definition above to help you decide.)

a)

b)

c)

d)

e)

ii) Which of the boxes represents a sample of a compound? Select all that apply. (Note: look at your definition above to help you decide.)

a)

b)

c)

d)

e)

iii) Which of the boxes represents a sample of a pure substance in the liquid phase? Select all that apply.

a)

b)

c)

d)

e)

iv) Which of the boxes represents a sample of a solution? Select all that apply.

a)

b)

c)

d)

e)

3. Below are two images representing a sample of water in two different phases at the level of
atoms and molecules (the particulate level).

Figure I.

Figure II.

a) Assuming the volume of the two figures is the same, which Figure has
the lowest density.

Figure I
Figure II

Explain how you arrived at your answer.

b) Identify the phase (gas, liquid or solid) depicted in Figure I.

Gas
Liquid
Solid

c) Identify the phase depicted in Figure II.

Gas
Liquid
Solid

d) Provide the symbol of the element for each type of atom in the figure.

Atom

Symbol

Red Atom

White Atom

e) What is the formula for the compound?

4. Is there anything about the questions that you feel you do not understand?
List your concerns/questions.

5. If there is one question you would like to have answered in lecture,
what would that question be?